Question 1

What files should I upload for an overmolding quote?

Accepted Answer

Upload 3D CAD (STEP preferred) for the substrate and overmold geometry, plus drawings/specs for cosmetic faces, witness zones, required Shore hardness (if elastomer), interface requirements, insert details (material, dimensions), and any inspection focus.

Question 2

What controls flash on overmold shutoffs?

Accepted Answer

Flash control is driven by shutoff sealing geometry, continuous shutoff contact, tooling alignment, venting strategy, and stable process window settings that avoid forcing soft material into shutoff gaps.

Question 3

How is retention achieved in overmolding?

Accepted Answer

Retention can be achieved through material adhesion, mechanical retention features (windows/undercuts/grooves), or a hybrid approach. The retention mechanism should be defined in the spec package and verified during sampling.

Question 4

Can overmolding be done onto metal inserts?

Accepted Answer

Yes. Metal insert overmolding is common for threaded components, pins, and structural hybrids. Insert location repeatability and thermal behavior are controlled through defined datums and loading features.

Question 5

What should be inspected on an overmolded part?

Accepted Answer

Typical inspection focus includes interface coverage, flash at shutoffs, bond-line condition/retention performance (as specified), witness location compliance, and critical interface dimensions tied to assembly or sealing.

Question 6

Can you support silicone overmolding (LSR)?

Accepted Answer

Yes—LSR silicone programs are supported when specified. Silicone overmolding uses a dedicated process approach and is typically used for sealing and high-temperature elastomer requirements.

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InjectionOvermolding